Just to straighten out a few things in this thread.
1. The picture that Kevin posted are tools to use for upsetting certain rivets. They are not rivets.
2. The black pins that Mom shows are a hybrid "axle" for the rollers. Part axle, part rivet. The rivet part is a tubular rivet.

I also noticed that Classic Parts list them as starting in 47. Not sure why 46 was not included. So be aware of possible fit/design/application/installation issues.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn